Leonardo Betancur

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The <i>IEEE 802.16</i> standard, also known as <i>WiMAX</i> is oriented to fixed broadband wireless metropolitan access. This work presents a novel proposal for the <i>PHY</i> layer and propagation model that allows a faster and more detailed the link level simulations execution. This paper describes the development process for the model and the(More)
This paper shows an implementation of a Radio Direction Finding prototype using three AoA algorithms and MIMO synchronization over a SDR platform, with a non-calibrated two element array. This algorithms were tested in three scenarios with different type of transmitted signals including baseband AM and FM sinusoidal tone and an AM modulated voice signal.(More)
Cognitive Radio (CR) is one of the most promising techniques for optimizing the spectrum usage. However, the large amount of data of spectral information that must be processed to identify and assign spectral resources increases the channel assignment times, therefore worsening the quality of service for the devices using the spectrum. Compressive Sensing(More)
This paper presents a bridge between theory and hardware implementations of radio direction finding (RDF) techniques particularly Angle of Arrival (AoA) and radiolocalization technique namely Time Difference of Arrival (TDoA) in non-collaborative scenarios. It presents aspects that must be considered in the system design and performance tests, including(More)
In this work, a compression strategy for Focal Plane Array Measurements (FPA_M) in Compressive Spectral Imaging (CSI) is presented. The strategy is applied to four CSI architectures. The implementation consists of two stages: transformation and coding. The transformation stage is performed according to the FPA_M structure. Finally, an arithmetic coding is(More)
In this paper we present a comparison of the peak to average power ratio (PAPR) between ortogonal frequency division multiplexing (OFDM) based on fast Fourier transform (FFT) and Fast-OFDM (FOFDM) based on discrete cosine transform (DCT). It is shown that although the probability of PAPR is slightly higher for systems using the discrete cosine transform,(More)
In this paper, we show a novel pilot-aided phase channel estimation approach based on theoretical relation between chromatic dispersion and coherence bandwidth, for pilots allocation in an symbol multiplexed by orthogonal frequency division multiplexing and transmitted to optical fiber system. The method is implemented on Matlab&#x00AE; to make a linear(More)
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